I had a dog once that usually honored the collar but occasionally you'd see her stop short, make a face, grit her teeth and charge beyond the signal range yelping all the way. Stubborn English pointer. Sure miss that dog she was a great hunter and friend. Old age got her. I guess I could have upped the discomfort but it just seemed too cruel. She'd stop short when she wanted to come home and bark until someone came out to let her in. Never went far or stayed long...it was almost like she was asserting her independence.